PRE EXERCISE WARMUP

Does warming up before a ride or other athletic event actually improve performance, or is it just a habit? There is good evidence that it does. A review of 32 studies found that warming up improved performance in 79% of the outcomes measured. In a cycling specific study, a 15-minute warm-up improved 3-km time-trial performance by 2.8%, with much of the benefit occurring during the first kilometer. And warming up may reduce injuries. A 2022 meta-analysis of 20 trials found that warm-up interventions were associated with approximately 16% fewer sports injuries, with larger benefits from structured programs incorporating strength, balance, and neuromuscular exercises. The evidence for preventing injuries specifically in cycling is less certain. So what happens physiologically when we warm up, and how does increasing muscle temperature contribute to better performance?

A warm up improves performance in two ways. It raises muscle temperature, which then changes how fast muscle contracts and how effectively oxygen and fuel are delivered. But it also has effects that are muscle temperature independent such as speeding the rise in oxygen uptake at the start of exercise and preparing the rider mentally.

Muscle temperature is not core temperature

Although the body maintains core temperature within a relatively narrow range, the temperature of peripheral muscles varies with environmental conditions, blood flow, and muscle activity. Resting muscle temperature can be several degrees lower than core temperature, particularly in muscle tissue farther from major blood vessels.

This graph from The Journal of Applied Physiology illustrates how exercising muscles generate heat and progressively warm, sometimes exceeding core temperature. Core temperature (diamonds) increased only modestly during exercise, while temperatures measured at three locations within the thigh increased more rapidly. The greatest increase occurred at the measurement site farthest from the femoral artery (triangles) which started off as the coolest.

Mechanisms that depend on muscle temperature include:

• Faster muscle contraction: Higher temperature accelerates actin-myosin cross-bridging as well as calcium release and re-uptake. These both mean the muscle cell will contract and relax more rapidly.
• Faster nerve conduction: Nerve conduction velocity increases with temperature, which can speed activation of muscle contraction.
• Increased blood flow: Local heating of the thigh increases blood flow to the heated muscle. Associated with an increases cardiac output, the result is improved oxygen and glucose fuel delivery.
• Easier oxygen release: Warmer tissue shifts the oxyhemoglobin dissociation curve so hemoglobin releases oxygen more readily at the muscle.

Effects that are not necessarily muscle temperature dependent:

• Faster oxygen uptake kinetics: Prior exercise speeds the rate at which oxygen uptake rises when hard exercise begins, sparing anaerobic energy production. This is the mechanism credited for the results in this 3-km time trial study. Passively heating muscle, without exercise, did not change energy turnover during subsequent exercise in another study, so temperature alone does not seem to explain this benefit.
• Psychological preparation: Warming up helps athletes focus, prepare mentally for competition, and reduce pre-performance anxiety.

Rate of force development

One measurable benefit of increased muscle temperature is the improvement in the Rate of Force Development (RFD), the speed at which muscles generate force. A 2025 systematic review and meta-analysis of studies that raised muscle temperature, by active or passive means, found that higher muscle temperature enhanced the RFD but not maximum force developed by the muscle. This held for both voluntary and electrically evoked contractions. In a soccer warm-up study, as muscle temperature rose 3.2 C the rate of torque development rose 20 to 30%, even though maximal voluntary torque declined.

This graph shows the general relationship between muscle temperature and RFD, as based on findings discussed in this review on the effect of passively raised muscle temperature on contractile function.

Note: The graph is illustrative, not a measured temperature-response curve. It shows RFD increasing as muscle temperature rises from approximately 35 C to 38.5 C (95 F to 101.3 F), followed by a decline above approximately 39 C (102.2 F). The rising portion is well supported. The decline at higher temperatures is much less certain, and the temperatures should not be interpreted as established thresholds for optimal muscle performance. Muscle temperatures of 39 C or higher are common during sustained hard exercise, and RFD describes short, high-power efforts such as sprints and accelerations, not endurance performance. The review also notes that voluntary muscle activation appears to be impaired by a rise in core temperature rather than by higher local muscle temperature, so any decline at high temperatures may reflect reduced neural drive (the central governor concept) rather than the muscle's own contractile machinery.

The shaded area represents the approximate range of normal human core temperatures. Without exercising, core temperature follows a daily circadian rhythm, generally reaching its lowest level in the early morning and its highest level in the late afternoon or early evening. Exercise can raise that core temperature further, depending on exercise intensity, duration, and environmental conditions.

Does warming up improve cycling performance?

In a study of eight well-trained road cyclists, both an easy 15-minute warm-up and a hard warm-up improved performance in a 3-km time by 2.8% and 2.6% respectively, compared with no warm-up. The hard warm-up gave no additional benefit. Roughly half of the gain came in the first 1000 m, where power was higher after warm-up (about 385 W versus 344 W). The authors attributed the improvement to faster oxygen uptake kinetics. They did not report measuring muscle temperature so it is unclear if this was a temperature dependent effect

Practical considerations

• Active versus passive warming: This meta-analysis found no greater benefit from active than from passive warming, which suggests that raising muscle temperature itself is an important factor in improving RFD and power, regardless of how the muscle is warmed.
• Temperature falls after you stop: Muscle temperature declines during rest after a warm-up, so the gap between the end of the warm-up and the start matters. In the soccer study, muscle temperature fell by about 1.4 C over a 12.5-minute rest, yet stayed above pre-warm-up levels, and RFD was still elevated at the end of it. Warm clothing or heated garments can help keep muscles warm while waiting at the start line.
• More is not better: The hard warm-up added nothing, and maximal voluntary torque actually fell after a hard soccer warm-up. A warm-up should prepare you for the effort, not tire you for it.
• Event duration and heat: The clearest benefits are for short, high-intensity efforts. For long endurance events the case is weaker. Warm ups in hot conditions could potentially add to heat stress during the event.
• Cold conditions: In cold weather peripheral muscle starts out cooler than the resting values shown above, so a longer warm-up and keeping the legs covered until the start matter more.

How long should you warm up?

How long should you warm up? The studies below suggest that 10 to 20 minutes is a reasonable range, with 15 minutes a good starting point for most cyclists. The goal is to raise muscle temperature and prepare the cardiovascular system while minimizing the risk of fatigue before the event. For a short, intense race, a 10- to 20-minute warm-up makes sense. For a long endurance ride, starting at an easy pace may accomplish much the same thing.